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# Copyright (c) Xuanyi Dong [GitHub D-X-Y], 2020.08 ##########################
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# NATS-Bench: Benchmarking NAS Algorithms for Architecture Topology and Size #
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"""The official Application Programming Interface (API) for NATS-Bench."""

from typing import Text, Optional
from nats_bench.api_size import NATSsize
from nats_bench.api_topology import NATStopology
from nats_bench.api_utils import ArchResults
from nats_bench.api_utils import pickle_load
from nats_bench.api_utils import pickle_save
from nats_bench.api_utils import ResultsCount


NATS_BENCH_API_VERSIONs = [
    "v1.0",  # [2020.08.31] initialize
    "v1.1",  # [2020.12.20] add unit tests
    "v1.2",  # [2021.03.17] black re-formulate
    "v1.3",  # [2021.04.08] fix find_best issue for fast_mode=True
    "v1.4",  # [2021.04.30] add topology_str2structure
]
NATS_BENCH_SSS_NAMEs = ("sss", "size")
NATS_BENCH_TSS_NAMEs = ("tss", "topology")


def version():
    return NATS_BENCH_API_VERSIONs[-1]


def create(file_path_or_dict, search_space, fast_mode=False, verbose=True):
    """Create the instead for NATS API.

    Args:
      file_path_or_dict: None or a file path or a directory path.
      search_space: This is a string indicates the search space in NATS-Bench.
      fast_mode: If True, we will not load all the data at initialization,
        instead, the data for each candidate architecture will be loaded when
        quering it; If False, we will load all the data during initialization.
      verbose: This is a flag to indicate whether log additional information.

    Raises:
      ValueError: If not find the matched serach space description.

    Returns:
      The created NATS-Bench API.
    """
    if search_space in NATS_BENCH_TSS_NAMEs:
        return NATStopology(file_path_or_dict, fast_mode, verbose)
    elif search_space in NATS_BENCH_SSS_NAMEs:
        return NATSsize(file_path_or_dict, fast_mode, verbose)
    else:
        raise ValueError("invalid search space : {:}".format(search_space))


def search_space_info(main_tag: Text, aux_tag: Optional[Text]):
    """Obtain the search space information."""
    nats_sss = dict(candidates=[8, 16, 24, 32, 40, 48, 56, 64], num_layers=5)
    nats_tss = dict(op_names=["none", "skip_connect", "nor_conv_1x1", "nor_conv_3x3", "avg_pool_3x3"], num_nodes=4)
    if main_tag == "nats-bench":
        if aux_tag in NATS_BENCH_SSS_NAMEs:
            return nats_sss
        elif aux_tag in NATS_BENCH_TSS_NAMEs:
            return nats_tss
        else:
            raise ValueError("Unknown auxiliary tag: {:}".format(aux_tag))
    elif main_tag == "nas-bench-201":
        if aux_tag is not None:
            raise ValueError("For NAS-Bench-201, the auxiliary tag should be None.")
        return nats_tss
    else:
        raise ValueError("Unknown main tag: {:}".format(main_tag))
